Speaking for the first time on the FBI’s statement saying they had found no criminal activity in new Hillary Clinton emails, Donald Trump said he doubts the agency could have really reviewed all the missives in time. “You can’t review 650,000 new emails in eight days,” Trump said Sunday night in Sterling Heights, MI. “You can’t do it, folks.”

His comment echoed his campaign manager Kellyanne Conway’s position on television hours earlier: “Do you think that they went through hundreds of thousands of emails in a week?” Conway said on MSNBC. “Because that may strike a lot of Americans as unusual.”

In FBI director James Comey’s Sunday statement, he said the FBI “has been working around the clock” to process the emails, and that they were only reviewing emails sent to and from Hillary Clinton while she was Secretary of State. (The emails were found on the laptop of Clinton aide Huma Abedin’s estranged husband, former congressman Anthony Weiner.) CNN also reports that many of the newly discovered emails were personal notes unrelated to the investigation or duplicates of what had already been seen.

But Trump’s theory goes farther than skepticism about FBI agents’ ability to check all the emails. He also said the FBI actually found Clinton to be guilty of a crime and withheld it from the public. “Hillary Clinton is guilty,” he said in Michigan. “She knows it, the FBI knows it, the people know it. And now it is up to the American people to deliver justice at the ballot box on Nov. 8.”

Hillary Clinton takes the stage to address supporters at the Brooklyn Navy Yard in New York, on June 7, 2016.

Doug Mills—The New York Times/Redux

Republican U.S. presidential candidate Donald Trump shows off the size of his hands as rivals Marco Rubio (L) and Ted Cruz (R) look on at the start of the U.S. Republican presidential candidates debate in Detroit, Michigan, on March 3, 2016.

Jim Young—Reuters

Hillary Clinton speaks about the FBI inquiry into her emails during a campaign rally in Daytona Beach, Florida, on Oct. 29, 2016.

A poster depicting Republican Presidential candidate Donald Trump is mounted on a lawn in West Des Moine, Iowa, on Jan. 25, 2016.

Natalie Keyssar for TIME

Nick McNamara, 31, Donald Trump I’m a college graduate. That’s an investment I made to make a good future for myself. But the playing field I’m in right now feels like, ‘What am I supposed to do?’ We’re becoming weakened in the face of the world. We’re not the global superpower that we used to be.From "Meet the First-Time Voters Who Are Changing the Presidential Election."

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Ted Cruz at CPAC in Harbor, Maryland, on Feb. 26, 2015

Mark Peterson—Redux for TIME

The wall of shame featuring Republican leaders who have criticized Trump, like former presidential candidate Mitt Romney inside the campaign headquarters of Donald Trump in New York City, on May 24, 2016.

Kentucky senator and Republican presidential candidate Rand Paul speaks to the media while eating ice cream during a campaign stop at Moose Scoops Ice Cream in Warren, New Hampshire.

M. Scott Brauer

Former Virginia governor and Republican presidential candidate Jim Gilmore (left), NH state director Anne Smith, and Gilmore's brother-in-law Lloyd Gatling, of Suffolk, Virginia, get in their car to travel to a polling location outside the Radisson Hotel in downtown Manchester, New Hampshire, on the day of primary voting, on Feb. 9, 2016.

M. Scott Brauer for TIME

John McEntee, Trump's Campaign Trip Director, rides a hoverboard at the campaign headquarters of Donald Trump in New York City, on May 24, 2016.

Landon Nordeman for TIME

Hillary Clinton speaks during a rally while former rival Bernie Sanders stands on stage at Portsmouth High School in Portsmouth, New Hampshire, on July 12, 2016. At the rally, Sanders officially endorsed Clinton as the Democratic nominee for president.

M. Scott Brauer

Donald Trump and Mike Pence speak in an overflow room at a campaign event in Roanoke, Virginia, on July 25, 2016.

Carlo Allegri—Reuters

Hillary Clinton welcomes Vice President Joe Biden as he disembarks from Air Force Two for a joint campaign event in Scranton, Pennsylvania, on Aug. 15, 2016.

Charles Mistoller—Reuters

Supporters are reflected in a teleprompter as Hillary Clinton addresses a campaign rally where former congresswoman Gabrielle Giffords and her husband astronaut Mark Kelly appeared with her, in Cincinnati, on Oct. 31, 2016.

Donald Trump waves to supporters as he leaves from a rally at Marshalltown Community School District - Roundhouse Gymnasium on Jan. 26, 2016.

Natalie Keyssar for TIME

Democratic nominee Hillary Clinton talks to reporters about the explosion in Chelsea neighborhood of Manhattan, New York, as she arrives at the Westchester County airport in White Plains, on Sept. 17, 2016.

Carlos Baria—Reuters

Marco Rubio appears with his family at his caucus location in Clive, Iowa, on Feb. 1, 2016.

Natalie Keyssar for TIME

Ted Cruz embraces his wife before boarding the campaign bus at a stop at Greene County Community Center in Jefferson, Iowa, on Feb. 1, 2016.

Natalie Keyssar for TIME

People wait for Donald Trump to speak at a campaign event on the tarmac of the airport in Kinston, North Carolina, on Oct. 26 2016.

Carlo Allegri—Reuters

Donald Trump arrives on stage to introduce his wife Melania during the Republican National Convention in Cleveland, Ohio, on July 18, 2016.

Ricky Carioti—The Washington Post/Getty Images

A delegate from Texas wears a cowboy hat with a campaign bumper sticker for Donald Trump during the Republican National Convention in Cleveland, Ohio, on July 20, 2016.

Daniel Acker—Bloomberg/Getty Images

Melania Trump kisses her husband, Donald Trump in front of an ecstatic crowd, on July 18, 2016.

Ben Lowy for TIME

Supporters of Donald Trump attempt to obscure a protestor from the activist group Code Pink, who is holding an anti-racism and anti-hate banner, as she interrupts the proceedings during the second day of the Republican National Convention in Cleveland, Ohio, on July 19, 2016.

Aaron Bernstein—Reuters

Hillary Clinton joins President Barack Obama on stage after he spoke at the Democratic National Convention in Philadelphia, on July 27, 2016. In his speech, Obama praised Clinton as the most qualified person for the office, ever. "I'm asking you to join me -- to reject cynicism, reject fear, to summon what's best in us; to elect Hillary Clinton as the next president of the United States," Obama said.

Doug Mills—The New York Times/Redux

Security backstage on the fourth day of the Democratic National Convention at the Wells Fargo Center in Philadelphia, Pennsylvania July 28, 2016.

Natalie Keyssar for TIME

Donald Trump delivers a speech during the evening session on the fourth day of the Republican National Convention at the Quicken Loans Arena in Cleveland, Ohio, on July 21, 2016.

Landon Nordeman for TIME

A delegate wears a dress covered in photos of President Barack Obama and first lady Michelle Obama at the Wells Fargo Center on the third day of the Democratic National Convention in Philadelphia, on July 27, 2016.

Damon Winter—The New York Times/Redux

Donald Trump takes the stage at the 2016 Republican National Convention in Cleveland, on July 18, 2016.

Landon Nordeman for TIME

Scenes from the Republican National Convention at the Quicken Loans Arena in Cleveland, on July 21, 2016.

Christopher Morris—VII for TIME

Members of College Democrats of America pose for pictures in the Instagram/ Facebook lounge at the 2016 Democratic National Convention in Philadelphia, on July 25, 2016.

Landon Nordeman for TIME

An ecstatic Hillary Clinton celebrates at the conclusion of the Democratic National Convention where she accepted the nomination in Philadelphia, on July 28, 2016.

Benjamin Lowy for TIME

New Jersey Gov. Chris Christie speaks to attendees during a campaign event at the Great American T-Bone Diner in Derry, N.H., on Feb. 9, 2016.

Landon Nordeman for TIME

Two women take pictures on stage before Donald Trump speaks at a campaign event in Springfield, Ohio, on Oct. 27, 2016.

From left Timothy Cardinal Dolan, Archbishop of New York, Donald Trump, Melania Trump and others listen as Democratic presidential nominee Hillary Clinton speaks during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria in New York, New York, on Oct. 20, 2016.

Brendan Smialowski—AFP/Getty Images

Steaks and chops described as 'Trump meat' are shown near the podium with Trump branded wines and water before Donald Trump was scheduled to appear at a press event at his Trump National Golf Club in Jupiter, Florida, on March 8, 2016.

Joe Skipper—Reuters

Donald Trump comforts Shalga Hightower, center, as she hugs family spokesman Charmil Davis during a meeting in Philadelphia, on Sept. 2, 2016. Hightower's daughter, Iofemi Hightower, was murdered in a 2007 attack at a Newark schoolyard.

Evan Vucci—AP

A U.S. Secret Service agent pulls a man's arm from the shoulder of Democratic presidential candidate Hillary Clinton as she greets workers inside the employee dining room at Harrah's Las Vegas on Feb. 20, 2016.

Justin Sullivan—Getty Images

WI Governor Scott Walker covers his face before Donald Trump attends a campaign roundtable with small business leaders in Altoona, Wisconsin, on Nov. 1, 2016.

Carlo Allegri—Reuters

Donald Trump's star on the Hollywood Walk of Fame is seen after it was vandalized, on Oct. 26, 2016.

Mario Anzuoni—Reuters

Hillary Clinton campaigning in the N.H. presidential primary at Winnacunnet High School, in Hampton, N.H., on Feb. 3, 2016.

James Nachtwey for TIME

Donald Trump arrives at a campaign event in Manchester, New Hampshire on Oct. 28, 2016.

Carlo Allegri—Reuters

A group of people fill a seated area before Donald Trump speaks at a campaign event in an airplane hangar in Rome, New York, on April 12, 2016.

Carlo Allegri—Reuters

Campaign signs left on the seats before Donald Trump's campaign rally at the Fox Theatre in Atlanta, on June 15, 2016.

President-elect Donald Trump speaks during his Victory Party on Tuesday, Nov. 8, 2016 in New York's Manhattan borough.

Dina Litovsky for TIME

Scenes at an election night party for Democratic presidential candidate Hillary Clinton, Tuesday, Nov. 8, 2016 in New York's Manhattan borough. Clinton faces Republican presidential candidate Donald Trump in the contest for president of the United States.